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1. 发明专利

SG68063A1 Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head 未知
公开(公告)号：SG68063A1
公开(公告)日：1999-10-19
申请号：SG1998001598
申请日：1998-07-08
申请人： HITACHI LTD
发明人： NARUMI SHUN-ICHI , FUKUI HIROSHI , HOSHINO KATSUMI , WATANABE KATSURO , KUDO KAZUE , FUYAMA MORIAKI
IPC分类号： G11B5/012 , G11B5/31 , G11B5/39 , G11B5/40 , G11B5/48 , G11B19/04
摘要： A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield (12) made of magnetic material, a lower inter-layer insulation film (14), a magnetoresistive effect type element (15) for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film (14'), and an upper magnetic shield (13) made of magnetic material, on a substrate (11) in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 mu OMEGA . cm.

2. 发明专利

JP2004152454A Magnetic head and its manufacturing method 审中-公开
公开(公告)号：JP2004152454A
公开(公告)日：2004-05-27
申请号：JP2002319434
申请日：2002-11-01
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KUDO KAZUE , OIKAWA GEN , OKAI TETSUYA , OTAKE ICHIRO , SHIINA HIROMI
IPC分类号： G11B5/31 , G11B5/39
CPC分类号： G11B5/3967 , G11B5/3109 , G11B5/3163 , Y10T428/115 , Y10T428/1186
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head which has high saturation magnetic flux density and which can generate a sufficient magnetic field corresponding to high recording density. SOLUTION: At least either of a lower part magnetic core and an upper part magnetic core has a magnetic pole layer of saturation magnetic flux density of 23,000 gauss or more consisting of a magnetic film including elements of two kinds or more out of Co, Ni, and Fe prepared by an electroplating method in a range of a plating bath of pH2 or less. COPYRIGHT: (C)2004,JPO

3. 发明专利

JP2002352403A THIN FILM MAGNETIC HEAD AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002352403A
公开(公告)日：2002-12-06
申请号：JP2001155855
申请日：2001-05-24
申请人： HITACHI LTD
发明人： OKADA YASUYUKI , KUDO KAZUE , HOSHIYA HIROYUKI
IPC分类号： C25D3/56 , C25D7/00 , G11B5/31 , H01F10/16 , H01F41/16
摘要： PROBLEM TO BE SOLVED: To provide a thin film magnetic head having sufficient recording power to a recording medium with a high coercive force. SOLUTION: In an electroplating method, modulating plating electric potential while forming a film allows the diameter of crystal grain to be modulated in the film thickness direction, a plating magnetic thin film of which the coercive force has been decreased to be obtained, and a magnetic film having good soft magnetic property to be formed also in the composition region to illustrate the high saturation magnetic flux density where soft magnetic property has not been obtained conventionally.

4. 发明专利

JP2001110007A MAGNETIC HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JP2001110007A
公开(公告)日：2001-04-20
申请号：JP28531199
申请日：1999-10-06
申请人： HITACHI LTD
发明人： TAKAHASHI HIROMASA , NARUMI SHUNICHI , KUDO KAZUE , HOSHIYA HIROYUKI , FUYAMA MORIAKI
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head which can increase a magnetic field that is generated at the tip of a write head by improving the efficiency of a magnetic circuit and decreasing the leaked magnetic flux. SOLUTION: The upper magnetic core of a magnetic head includes an upper magnetic core tip part 104 which is opposite to the surface of a recording medium and an upper magnetic core rear part 110 which is connected to the part 104. The rear end face of the part 104 is connected to the front end face of the part 110 to form a connection surface 114 on the extended surface of an insulating layer 103 that is prepared under a coil 107 or on a contact hole that is prepared at the back of the part 104 set on the extended surface of the layer 103. The surface 114 is formed substantially vertical to the surface of a substrate or at an angle of

5. 发明专利

JPH1125422A THIN FILM MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH1125422A
公开(公告)日：1999-01-29
申请号：JP17551697
申请日：1997-07-01
申请人： HITACHI LTD
发明人： KUDO KAZUE , OKADA TOSHIHIRO , NARUMI SHUNICHI , ARAI REIKO
IPC分类号： G11B5/31 , G11B5/127
摘要： PROBLEM TO BE SOLVED: To obtain the thin film magnetic head, in which narrow track widths are formed with a high density and a high resistivity, a top section magnetic film having a high saturation magnetic flux density is obtained and no reading and writing blotting occurs. SOLUTION: A bottom section magnetic core 12 is formed on a substrate 11, an Al2 O3 film is formed as the film of a magnetic gap 13 using an RF sputtering method and also an insulating film SiO2 14 is formed. Then, a photoresist 15 is painted, exposed through a photomask and developed to form a pattern. Then, an SiO2 etching is performed employing CHF3 for the etching gas. Then, a magnetic film 18 is formed by a plating method to obtain the film thickness which is required as a top section magnetic core, a photoresist is painted over the formed laminated magnetic film, exposed through a photomask, developed to form a pattern, an ion milling is used to obtain a core shape through a patterning and the top section magnetic core is obtained.

6. 发明专利

JPH09212828A MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH09212828A
公开(公告)日：1997-08-15
申请号：JP1734996
申请日：1996-02-02
申请人： HITACHI LTD
发明人： AONO HIDEKI , WATANABE KATSURO , OKADA TOSHIHIRO , KUDO KAZUE
IPC分类号： G11B5/31 , G11B5/00 , G11B5/23 , G11B5/39 , H01F10/12 , H01F10/13 , H01F10/18 , H01F10/187 , H01F10/28
摘要： PROBLEM TO BE SOLVED: To form a lower gap insulating film of =200 deg.C or the film 12a is formed after the lower gap insulating film 13a is formed. The film 13a is formed at >=200 deg.C by thermal oxidation, CVD or other method.

7. 发明专利

JPH08106616A MAGNETIC HEAD 失效
公开(公告)号：JPH08106616A
公开(公告)日：1996-04-23
申请号：JP24364894
申请日：1994-10-07
申请人： HITACHI LTD
发明人： AONO HIDEKI , KUDO KAZUE , KAWABE TAKASHI , AIHARA MAKOTO
IPC分类号： G11B5/49 , G11B5/60 , G11B21/21
摘要： PURPOSE: To simply manufacture a magnetic head at a low cost without using adhesives for fixing and soldering, etc., for electric conduction when a magnetic head element is mounted on wiring incorporated type suspension. CONSTITUTION: This magnetic head is constituted of the magnetic head element 1 coming into contact with a recording medium and the wiring incorporated type suspension 2 provided with a magnetic head holding hole 5 having projection parts 4a, 4b, 4c inside of the suspensions. By inserting the magnetic head element 1 into the magnetic head hold hole 5, the magnetic head element 1 is fixed and supported to the wiring incorporated type suspension 2 by the projection parts 4a, 4b, 4c, and the electric conduction is also obtained by bringing into contact between connection terminals 1b, 3a. Further, supporting points where the magnetic head element are fixed and supported to the wiring incorporated type suspension 2 become close to a magnetic recording medium, not shown in figure, compared with a usual method.

8. 发明专利

JPH0877514A MAGNETORESISTIVE HEAD 失效
公开(公告)号：JPH0877514A
公开(公告)日：1996-03-22
申请号：JP21009194
申请日：1994-09-02
申请人： HITACHI LTD
发明人： KUDO KAZUE , KAWABE TAKASHI , AONO HIDEKI , NAKAMOTO KAZUHIRO , FUYAMA MORIAKI , OKAI TETSUYA
IPC分类号： G11B5/39
摘要： PURPOSE: To attain high output and high recording density by forming an insulating film with a mixture of Al2 O3 with SiO2 , ZrO2 , TiO2 , Ta2 O5 , HfO2 , etc., by sputtering in a gaseous atmosphere. CONSTITUTION: A magnetoresistive magnetic separation film 1 is made of an insulating material obtd. by mixing Al2 O3 as a base with one or more among SiO2 , ZrO2 , TiO2 , Ta2 O5 , HfO2 and Nb2 O5 . In this case, an insulating thin film having 5,000KV/cm dielectric strength can be formed in 30nm thickness. When a magnetic head using the insulating thin film as a magnetic separation film is produced, the output and recording density of the magnetic head can be relatively easily increased, accordingly the output and recording density of a magnetic recorder can also be increased and work efficiency is enhanced.

9. 发明专利

JPH06273479A METHOD AND DEVICE FOR EVALUATING RELIABILITY OF WIRING 失效
公开(公告)号：JPH06273479A
公开(公告)日：1994-09-30
申请号：JP5839093
申请日：1993-03-18
申请人： HITACHI LTD
发明人： FUKADA SHINICHI , KUDO KAZUE , MINEMURA TETSUO
IPC分类号： G01R31/02 , G01R31/26 , H01L21/3205 , H01L21/66 , H01L23/52 , H05K10/00
摘要： PURPOSE:To evaluate conduction life without depending on wiring length by completing the measurement, of a sample wiring length at a point when the shortest conduction life is obtained out of the conduction life of a plurality of samples. CONSTITUTION:A sample 21 and Si substrate 21 are placed inside a constant- temperature bath 30. A constant current is applied from current terminals 23 and 24 through a power supply 31. At the same time, the voltage among voltage terminals 25-29 which are spaced equally is measured 32 and then the resistance between the voltage terminals is calculated according to the relationship between current and voltage. The distance between the voltage terminals is changed from 100 to 100mum for evaluation. The point when wiring resistance increases by 20 % in reference to the point where the resistance becomes stable and reaches a constant value is set as the conduction life of the sample. As the wiring length is reduced, the distribution of the conduction life is increased but the conduction life cannot be reduced without any limitation and a shortest value Lt0 exists. Namely, the conduction life is longer than Lt0 regardless of the wiring length. By estimating the wiring life with Lt0, a highly reliable evaluation can be obtained. Also, it is sufficient if a life which is approximately 20% of the entire part is made known and evaluation can be made quickly.

10. 发明专利

JPH02160560A THERMOSENSITIVE HEAD 失效
公开(公告)号：JPH02160560A
公开(公告)日：1990-06-20
申请号：JP31389588
申请日：1988-12-14
申请人： HITACHI LTD
发明人： KUDO KAZUE , KOIZUMI MASAHIRO , SUZUKI HITOSHI , ONUKI HITOSHI
IPC分类号： B41J2/345
摘要： PURPOSE:To increase the reliability of a junction on a bonded wire by forming only the peripheral area of a thermal resistor on a ceramic substrate, minimizing the area of the ceramic substrate and connecting a conductor and a drive IC to the thermal resistor on a wired substrate where the drive IC is mounted by wire bonding technique. CONSTITUTION:A ceramic substrate 2 where a thermal resistor 1 is formed and a wired substrate 6 where a drive IC 5 is mounted, are fixed in an adjacent position to each other. A conductor 7 connected to the thermal resistor continues to the surface of the wired substrate 6, and is electrically connected to the drive IC with a bonded wire 4 on the substrate. The conductor is formed upto the side of the substrate by an electric connection between the two substrates. Then the two substrates are electrically bonded together by a mutual adhesion method in which the conductor is formed upto the side of the substrate. As an alterative method, the substrates are electrically connected with conductive resins such as soldering paste 8 applied to an area between the conductors after formation of the conductor on each substrate.

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